You can play around with all Plone themes. Just activate them and customize their look to your liking, change logo, add portlets, use forms, embed content and other stuff.

Activate new Plone theme

To activate :

• Log in by entering ploneadmin as username and password
• Follow Theming
• Click Activate on the theme you'd like to try out.

Free

For more information on the particular theme click the image below.

SunRain Responsive Plone Theme